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Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2026,1,27]]},"abstract":"<jats:p>\n                    The evolutionary arms race between viruses and hosts shapes host antiviral defenses and viral immune evasion, yet the mechanisms driving divergence in viral cross-species pathogenicity remain unclear. Here, we investigated the role of single amino acid polymorphisms (SAPs) in stimulator of interferon genes (STING) in modulating immune evasion and pathogenicity spectrum of infectious spleen and kidney necrosis virus (ISKNV). The ISKNV-encoded protein VP012R targets mandarin fish STING (\n                    <jats:italic toggle=\"yes\">sc<\/jats:italic>\n                    STING) for ubiquitination at residues C196 and K315, promoting its degradation to suppress interferon responses. Importantly, the K315\/R315 polymorphism acts as a molecular switch: Susceptible species with the K315 residue exhibit STING degradation and viral immune evasion, whereas resistant species with the R315 residue maintain STING stability and antiviral defenses. Phylogenetic analysis linked K315 to high-mortality hosts (\u226550% lethality) vs. R315 in resistant species (\u226425% lethality). These findings suggest that the molecular mechanisms underlying the viral pathogenicity spectrum may be modulated by host protein SAPs, thereby enhancing our understanding of host\u2013virus coevolution in terms of biological diversity.\n                  <\/jats:p>","DOI":"10.1073\/pnas.2523268123","type":"journal-article","created":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T18:50:12Z","timestamp":1769194212000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":2,"title":["STING single amino acid polymorphisms modulate iridovirus immune evasion and pathogenicity spectrum"],"prefix":"10.1073","volume":"123","author":[{"given":"Xiaowei","family":"Qin","sequence":"first","affiliation":[{"name":"State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University","place":["Guangzhou, China"]},{"name":"Guangdong Provincial Observation and Research Station for Marine Ranching of the Lingdingyang Bay, School of Marine Sciences, Sun Yat-sen University","place":["Guangzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mincong","family":"Liang","sequence":"additional","affiliation":[{"name":"State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University","place":["Guangzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3282-9641","authenticated-orcid":false,"given":"Weiqiang","family":"Pan","sequence":"additional","affiliation":[{"name":"State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Province Key Laboratory for Aquatic Economic 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China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanlin","family":"You","sequence":"additional","affiliation":[{"name":"State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University","place":["Guangzhou, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaoping","family":"Weng","sequence":"additional","affiliation":[{"name":"State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University","place":["Guangzhou, 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Fermin, P. Tennant, \u201cChapter 10: Host\u2013virus interactions: Battles between viruses and their hosts\u201d in Viruses, P. Tennant, G. Fermin, J. E. Foster, Eds. 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